Spin Chain Connectors, Entanglement by Measurements and Mesoscopic Quantum Coherence

近年来，在与量子力学有关的两个领域取得了迅速的进展。首先，受到量子力学允许新计算能力的刺激，现在全世界都在努力实现量子计算机。确定可行的方法来连接和网络这些计算机是这一努力的内在部分。这项研究可能会给信息技术带来革命。其次，一些介观系统在一系列大胆的实验中表现出量子力学的行为。通过扩展我们通常认为的量子世界的边界，他们提出了一个问题，即是否任何系统，无论多么宏观，都可以在适当设计的实验中表现出量子行为。我的研究旨在突破上述两种发展的界限。在连接和网络问题上，我想研究自旋链（小的一维量子磁体）如何有效地连接量子计算机，以及它们如何作为真正的量子力学相关性的来源。我还想探索是否能以一种有效的方式探测到来自遥远地方的光可以纠缠遥远的物质系统，甚至是高维的。在推动我们所认为的量子世界边界的问题上，我打算探索是否通过将微观系统和介观系统耦合起来，可以探测到后者的量子本质。

Recent years have seen a rapid progress in two areas connectedwith quantum mechanics. Firstly, stimulated by the ability ofquantum mechanics to permit novel computation, there is now a world wideeffort to realize a quantum computer. Identifying viable ways toconnect and network such computers is an intrinsic part of thiseffort. This research could revolutionize information technology.Secondly, some mesoscopic systems have been shown to behavequantum mechanically in series of audacious experiments. By stretching the boundary of what we generally regard as the quantum world, they beg the question as to whether any system, however macroscopic, can be made to exhibitquantum behaviour in an appropriately designed experiment. Myresearch aims to push the boundaries of both the abovedevelopments. On the connecting and networking issue, I want to investigate how chains of spins (small one dimensional quantum magnets) can connect up quantum computers efficiently and how they can serve as a source of genuine qunatum mechanical correlations. I also want to explore whether detection of light from distant places in a efficient ways can entangle distant matter systems, even high dimensional ones. On the issue of pushing the boundaries of what we regard as the quantum world, I intend to explore whether by coupling a microscopic and a mesoscopic system one can probe the quantum nature of the latter.